This is a sample app that displays a basic implementation of CLVisist now available in iOS 8 which allows your app to receive location events from the system whenever a user is present at one place for more than just a moment and when they then leave that area. These are referred to as "visits" and can be handy if you want to know that a user has visited a restaurant, gone to class, etc so that you can send them some sort of notification.
The demo app here contains two components for familiarizing you with the API: it posts a local notification as soon as an event is received, and it plots the location of each of those events on a map so you can gauge the accuracy for yourself.
While vetting this for a work project I installe it onto my phone and carried it with me all day to see how it would turn my days movements into a sequence of visits.